Fisher FM-50 FM Tuner (1959)

Name: Fisher FM-50
Brand: Fisher

The Fisher FM-50 is a classic FM-only tuner introduced in 1959, representing Fisher Radio Corporation's commitment to high-fidelity audio during the transition from AM to FM broadcasting. As one of Fisher's early dedicated FM tuners, the FM-50 was engineered for audiophiles seeking superior reception and sound quality during a pivotal moment in radio history—just before the rollout of stereo FM broadcasting in 1961.

Despite being a pre-stereo era unit, the FM-50 was designed with forward-thinking features that made it compatible with emerging stereo multiplex technology, allowing it to remain relevant as the industry evolved. Built around six vacuum tubes, the FM-50 delivers the warm, smooth reception characteristic of tube-based tuners and was praised for its excellent selectivity and sensitivity for its time.

Specifications

Feature	Specification
Model	FM-50
Brand	Fisher
Year of Production	1959–1960
Category	FM Tuner (Receiver Component)
Tuning Bands	FM Only
Power Output	N/A (No internal amplifier)
Output Impedance	Estimated 600 ohms (typical for tube equipment)
Sensitivity	~3 μV for 20 dB quieting
Tuning Display	Slide-rule dial with analog tuning meter
Tubes Used	6AU6, 6BA6, 6BE6, 12AT7, 12AU7, OA2 (6 total)
Key Features	AFC switch, multiplex output for stereo readiness, high-gain RF/IF stages
Dimensions	19" (W) × 7" (H) × 10.5" (D)
Weight	~22 lbs
Finish	Brushed aluminum front panel with black cabinet accents

Historical Context

The Fisher FM-50 was released at a turning point in broadcast audio. In 1959, FM radio was still gaining traction in American homes, valued for its static-free transmission and superior audio fidelity compared to AM. Fisher, founded by Avery Fisher—a renowned audiophile and engineer—positioned itself as a leader in high-end audio equipment.

The FM-50 exemplifies Fisher’s engineering philosophy: prioritize signal clarity, build quality, and user experience. Though it predates the official adoption of stereo FM (which began in 1961), the FM-50 included a multiplex output, allowing it to interface with external stereo decoders when they became available. This made it one of the first "stereo-ready" tuners on the consumer market.

Its slide-rule tuning dial and prominent analog meter provided precise station tuning, a significant advantage in an era when FM station spacing was still being standardized. The inclusion of an AFC (Automatic Frequency Control) switch allowed users to stabilize reception, though it could be disengaged for fine manual tuning.

Sound Signature

The FM-50 delivers a warm, rich sound profile typical of tube-based front-end circuitry. Its RF and IF stages, built around high-quality tubes like the 6BA6 and 12AT7, provide smooth frequency response and excellent rejection of adjacent-channel interference. Listeners often note its natural midrange and stable stereo imaging (when used with a multiplex adapter), making it a favorite among vintage radio enthusiasts.

Even by modern standards, the FM-50 performs admirably in areas with strong FM signals, offering clarity and depth that many solid-state tuners lack.

Maintenance and Restoration Tips

As a 1959 tube device, the Fisher FM-50 typically requires restoration to operate safely and reliably:

Capacitor Replacement: All electrolytic and paper capacitors should be replaced. Old capacitors can leak, cause shorts, or degrade performance.
Tube Testing/Replacement: While tubes may still function, it's advisable to test or replace them. The 6BE6 and 12AT7 are particularly critical for oscillator and mixer performance.
Resistor Check: Carbon composition resistors may have drifted in value over time; check and replace if necessary.
Cleaning: Clean tube sockets, controls, and jacks with electronic contact cleaner. The tuning dial and meter mechanism should be inspected for smooth operation.
Alignment: After servicing, the IF and RF stages should be realigned using proper test equipment to restore optimal sensitivity and selectivity.
Power Supply: The OA2 voltage regulator tube and associated components should be verified to ensure stable B+ voltage.

Due to its age, always power up the unit through a variac or current limiter during initial testing to avoid catastrophic failure.

Collectibility and Market Value

The Fisher FM-50 holds moderate collectibility with a rating of 6/10. It appeals to vintage audio collectors, especially those focused on the evolution of FM broadcasting or Fisher's product lineage. Fully restored units in excellent cosmetic and functional condition typically sell for $100–$250.

Units with original packaging, manuals, or service literature may command higher prices. While not as rare as some contemporaneous models from Marantz or Scott, the FM-50 is respected for its build quality and historical significance as a bridge between mono FM and the stereo era.

Conclusion

The Fisher FM-50 is more than just a vintage tuner—it's a snapshot of audio innovation at the dawn of the FM age. With its tube-driven warmth, precision tuning, and forward-looking design, it remains a rewarding project for restorers and a capable performer for vintage hi-fi systems. Whether used as a standalone tuner or integrated into a classic audio stack, the FM-50 continues to deliver the clarity and charm that defined Fisher’s legacy.